Quick replacement device and method for numerical control tool

Abstract

The invention belongs to the technical field of numerical control machine tools, and particularly relates to a quick replacement device for a numerical control tool and a replacement method of the quick replacement device. A three-jaw chuck used for clamping a workpiece, a tailstock used for assisting machining of the workpiece, a driving system used for machining driving and a tool rest system used for machining of the workpiece are arranged in the machine tool body. The tool rest system is composed of a longitudinal feeding mechanism used for driving a tool rest to move longitudinally and an electric tool rest used for automatic tool changing in the workpiece machining process. According to the rapid replacing device of the numerical control tool and the replacing method of the rapid replacing device, the rapid clamping mechanism and the limiting driving mechanism are arranged, in the using process, the rapid clamping mechanism is driven and limited through the limiting driving mechanism, when the tool is replaced, the tool is rapidly taken out of a tool groove and placed into the tool groove, and then the tool is rapidly locked and installed; therefore, the problem that the cutter replacement efficiency of an existing numerical control machine tool is low is solved.

Description

Technical Field

[0001] The invention relates to the technical field of numerical control machine tools, and in particular to a rapid replacement device for numerical control tools and a replacement method thereof. Background Art

[0002] CNC machine tool is the abbreviation of digital control machine tool, which is an automated machine tool equipped with a program control system. The control system can logically process programs specified by control codes or other symbolic instructions, decode them, express them in coded numbers, and input them into the CNC device through information carriers. After calculation and processing, the CNC device sends various control signals to control the movement of the machine tool and automatically process the parts according to the shape and size required by the drawing.

[0003] CNC machine tools include CNC horizontal lathes. The spindle of the CNC horizontal lathe adopts manual control, mechatronics design, beautiful appearance, reasonable structure, wide application and easy operation. The machine tool can realize automatic control and can turn the inner and outer circles, end faces, grooving, arbitrary conical surfaces, spherical surfaces and public and imperial threads, conical threads and other processes of various parts, which is suitable for mass production.

[0004] When a CNC horizontal lathe processes a workpiece, different tools need to be used according to different processing requirements. The existing tool replacement method is to use hexagon socket bolts to rotate multiple bolts on the tool holder to separate the bolts from the tool, take out the tool, and then rotate the multiple bolts and insert and lock them on the surface of the tool. It is necessary to rotate multiple bolts in sequence, which makes tool replacement inconvenient. Therefore, a CNC tool quick replacement device and a replacement method are needed. Summary of the invention

[0005] Based on the technical problem of low tool replacement efficiency of existing CNC machine tools, the present invention proposes a CNC tool rapid replacement device and a replacement method thereof.

[0006] A rapid replacement device for CNC tools proposed in the present invention comprises a CNC machine tool body, wherein the CNC machine tool body is composed of a machine tool base, a machine tool body on the upper surface of the machine tool base, a control system arranged on the surface of the machine tool body, and a machine tool protective door slidably connected to the surface of the machine tool body. A three-jaw chuck for clamping a workpiece, a tailstock for assisting in machining the workpiece, a drive system for machining drive, and a tool holder system for machining the workpiece are respectively arranged inside the machine tool body, and the tool holder system is composed of a longitudinal feed mechanism for driving the longitudinal movement of the tool holder and an electric tool holder for automatic tool change during workpiece machining.

[0007] The upper surface of the electric tool holder is provided with a quick clamping mechanism for quickly replacing a machining tool and a limit driving mechanism for driving and limiting the quick clamping mechanism.

[0008] The four quick clamping mechanisms and the four limit drive mechanisms are symmetrically distributed on the upper surface of the electric tool holder, and respectively correspond to the four tool slots provided on the electric tool holder.

[0009] Among them, when the locking pawl and the locking ratchet wheel in the limit drive mechanism of the quick clamping mechanism are plugged, the tool is clamped and limited and locked, which is convenient for quick installation of the tool.

[0010] Among them, when the locking pawl and the locking ratchet are separated in the limit drive mechanism of the quick clamping mechanism, the tool is released from the clamping limit lock, so as to facilitate the quick removal of the tool.

[0011] Preferably, the quick clamping mechanism comprises a tool clamping block, the two tool clamping blocks are symmetrically distributed around the axis of the tool slot, and the lower surfaces of the two tool clamping blocks are provided with knurling for increasing the clamping friction force on the tool.

[0012] The upper surface of the tool clamping block is fixedly connected with a guide limiting column, and the inner top wall of the tool groove is fixedly provided with two guide grooves corresponding to the guide limiting column, and the inner walls at both ends of the guide groove are in an arc shape.

[0013] Preferably, one end of the guide limit column extends to the upper surface of the electric tool holder through the guide groove, and the surface of the guide limit column is adapted to be slidably connected with the inner wall of the guide groove.

[0014] The inner wall of the guide groove is rotatably connected to a limiting ball through a rotating groove, and a plurality of the limiting balls are symmetrically distributed with the axis of the guide groove as the center. Two symmetrically distributed ball grooves are fixedly provided on the surface of the guide limiting column, and the inner wall of the ball groove is slidably connected to the surface of the limiting ball.

[0015] Preferably, the surfaces of the two tool clamping blocks are provided with step grooves, the inner walls of the step grooves are slidably connected with force blocks, the surfaces of the force blocks are U-shaped, and the two end surfaces of the force blocks are fixedly connected with magnets with T-shaped surfaces by bolts.

[0016] The inner wall of the step groove is fixedly provided with an inserting groove, and the inner walls of the two inserting grooves are respectively adapted to be slidably inserted into the surfaces of the two magnets.

[0017] Preferably, a guide rod is fixedly connected to the upper surface of the force applying block, and the two guide rods are symmetrically staggered around the axis of the force applying block, and one end of the guide rod passes through and extends to the upper surface of the electric tool holder.

[0018] Preferably, a driving column is fixedly connected to the upper surface of the force block, one end of the driving column penetrates and extends to the upper surface of the electric tool holder, and a driving bevel groove is fixedly provided on the surface of the driving column, and a plurality of the driving bevel grooves are evenly distributed on the surface of the driving column.

[0019] The limit drive mechanism comprises a drive frame, which is fixedly mounted on the upper surface of the electric tool holder, a bearing seat is fixedly mounted on the upper surface of the drive frame, and an inner wall of the bearing seat is rotatably connected to a drive shaft via a bearing.

[0020] The two ends of the driving shaft are respectively fixedly connected with a locking ratchet and a driving ratchet, and the surface of the driving ratchet is plugged into the inner wall of the driving bevel tooth groove.

[0021] Preferably, the surface of the driving shaft is rotatably connected to a force applying handle, the inner wall of the force applying handle is slidably connected to the surface of the locking ratchet, the inner wall of the force applying handle is rotatably connected to a driving tooth tongue, and one end of the driving tooth tongue is plugged into the surface of the locking ratchet.

[0022] Preferably, the upper surface and lower surface of the other end of the driving tongue are respectively provided with a limiting arc groove and an auxiliary groove, the inner wall of the auxiliary groove is fixedly connected with a support spring, and one end of the support spring is plugged into the inner bottom wall of the force applying handle.

[0023] The upper surface of the force applying handle is threadedly connected with a handle limiting bolt, and one end of the handle limiting bolt penetrates and extends to the inner wall of the force applying handle and is plugged into the inner wall of the limiting arc groove.

[0024] Preferably, the inner wall of the driving frame is rotatably connected to a locking shaft, the surface of the locking shaft is sleeved with a torsion spring, the surface of the locking shaft is fixedly connected to a locking pawl, the two ends of the torsion spring are respectively fixedly connected to the inner wall of the driving frame and the surface of the locking pawl, and one end of the locking pawl is plugged into the surface of the locking ratchet.

[0025] Preferably, a method for replacing a quick-change device for a numerical control tool comprises the following steps: Step 1: When replacing the chip cutting tool on the electric tool holder, move the locking pawl to separate the locking pawl from the locking ratchet, release the lock on the locking ratchet, and then lift the drive column.

[0026] Step 2: The force block is driven upward by pulling the driving column. The force block drives the two tool clamping blocks to separate from the tool through the magnet, and the tool is taken out.

[0027] Step 3. After taking out the tool in the tool slot and putting the new tool into the tool slot, release the pull on the drive column. Under the gravity of the tool clamping block and the force block, the tool clamping block and the force block move downward, and the lower surface of the tool clamping block is plugged into the surface of the tool. Then, the driving tooth tongue on the force handle is plugged into the surface of the locking ratchet. Turn the force handle, and the force handle drives the locking ratchet to rotate. The locking ratchet drives the driving shaft and the driving ratchet to rotate. The driving ratchet drives the driving column to move downward through the driving oblique tooth groove, and drives the force block to move downward, so that the two tool clamping blocks are plugged and pressed against the surface of the tool to lock the tool. When the locking ratchet rotates, the locking pawl is always in contact with the surface of the locking ratchet through the force of the torsion spring to lock the locking ratchet.

[0028] The beneficial effects of the present invention are: 1. By setting a quick clamping mechanism and a limit driving mechanism, when in use, the quick clamping mechanism is driven and limited by the limit driving mechanism. When the tool is replaced, the tool can be quickly taken out of the tool slot and put into the tool, and the tool can be quickly locked and installed, thereby solving the problem of low tool replacement efficiency of existing CNC machine tools.

[0029] 2. By setting a limit drive mechanism, when in use, the locking ratchet is locked by the locking pawl in the limit drive mechanism, so as to lock the drive shaft and the drive ratchet, and lock the force block and the tool clamping block, thereby solving the problem that the existing replacement method uses bolts to clamp the tool, the contact area is small, and the bolts are connected to the tool holder through threads to lock the tool, and the bolts often loosen, causing the tool to move, thereby affecting the processing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of a quick-changing device for a numerically controlled tool and a changing method thereof proposed by the present invention; Figure 2 A schematic diagram of the structure of a longitudinal feeding mechanism of a quick-changing device for numerically controlled tools and a changing method thereof proposed by the present invention; Figure 3 A three-dimensional diagram of the electric tool holder structure of a CNC tool quick-change device and a replacement method thereof proposed by the present invention; Figure 4 A three-dimensional diagram of the tool pressing block structure of a CNC tool quick replacement device and a replacement method thereof proposed by the present invention; Figure 5 A three-dimensional diagram of the guide limit column structure of a CNC tool quick replacement device and a replacement method thereof proposed by the present invention; Figure 6 A three-dimensional diagram of the force block structure of a rapid replacement device for a numerical control tool and a replacement method thereof proposed by the present invention; Figure 7 A three-dimensional diagram of the structure of a drive frame of a rapid replacement device for a numerical control tool and a replacement method thereof proposed by the present invention; Figure 8 A quick replacement device and a replacement method for a numerical control tool proposed by the present invention Figure 7 A magnified view of the structure at center; Fig. 9 The present invention provides a side view of a driving frame structure of a rapid replacement device for numerically controlled tools and a replacement method thereof.

[0031] In the figure: 1. machine tool base; 2. machine tool body; 3. control system; 4. machine tool protection door; 5. three-jaw chuck; 6. tailstock; 7. drive system; 8. tool holder system; 801. longitudinal feed mechanism; 802. electric tool holder; 9. tool clamping block; 901. guide limit column; 902. guide groove; 903. limit ball; 904. ball groove; 905. force block; 906. magnet; 907. guide rod; 908. Driving column; 909, driving bevel tooth groove; 10, driving frame; 1001, bearing seat; 1002, driving shaft; 1003, locking ratchet; 1004, driving ratchet; 1005, force handle; 1006, driving tooth tongue; 1007, limiting arc groove; 1008, auxiliary groove; 1009, supporting spring; 1010, handle limiting bolt; 1011, locking shaft; 1012, torsion spring; 1013, locking pawl. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] Reference Figure 1-Figure 9 A quick-changing device for CNC tools includes a CNC machine tool body, which is composed of a machine tool base 1, a machine tool body 2 on the upper surface of the machine tool base 1, a control system 3 arranged on the surface of the machine tool body 2, and a machine tool protection door 4 slidably connected to the surface of the machine tool body 2. The inside of the machine tool body 2 is respectively provided with a three-jaw chuck 5 for clamping a workpiece, a tailstock 6 for assisting in processing the workpiece, a drive system 7 for processing drive, and a tool holder system 8 for processing the workpiece.

[0034] The tool rest system 8 is composed of a longitudinal feed mechanism 801 for driving the tool rest to move longitudinally and an electric tool rest 802 for automatic tool change during workpiece processing.

[0035] The upper surface of the electric tool holder 802 is provided with a quick clamping mechanism for quickly replacing the machining tool and a limit driving mechanism for driving and limiting the quick clamping mechanism.

[0036] The four quick clamping mechanisms and the four limit drive mechanisms are symmetrically distributed on the upper surface of the electric tool holder 802 , and respectively correspond to the four tool slots provided on the electric tool holder 802 .

[0037] The quick clamping mechanism comprises a tool clamping block 9. The two tool clamping blocks 9 are symmetrically distributed with the axis of the tool groove as the center. The lower surfaces of the two tool clamping blocks 9 are provided with knurling for increasing the friction force of clamping the tool.

[0038] A guide limit column 901 is fixedly connected to the upper surface of the tool clamping block 9, and two guide grooves 902 corresponding to the guide limit column 901 are fixedly opened on the inner top wall of the tool groove, and the inner walls at both ends of the guide groove 902 are in arc shape.

[0039] Furthermore, the guide limit column 901 is fixedly connected to the tool clamping block 9 by bolts, thereby facilitating replacement and maintenance of the tool clamping block 9.

[0040] One end of the guide limit column 901 extends to the upper surface of the electric tool holder 802 through the guide groove 902 , and the surface of the guide limit column 901 is adapted to be slidably connected with the inner wall of the guide groove 902 .

[0041] The inner wall of the guide groove 902 is connected to the limiting ball 903 through a rotating groove. Multiple limiting balls 903 are symmetrically distributed around the axis of the guide groove 902. Two symmetrically distributed ball grooves 904 are fixedly provided on the surface of the guide limiting column 901. The inner wall of the ball groove 904 is slidably connected to the surface of the limiting ball 903.

[0042] When in use, by setting the limiting ball 903, it not only reduces the friction between the guide limiting column 901 and the guide groove 902 when the guide limiting column 901 is lifted and lowered, but also, through the cooperation of the limiting ball 903 and the ball groove 904, it further improves the guiding accuracy of the guide limiting column 901, thereby achieving a better guiding and limiting effect.

[0043] The surfaces of the two tool clamping blocks 9 are both provided with step grooves, and the inner walls of the step grooves are slidably connected with force blocks 905. The surface of the force blocks 905 is U-shaped, and the surfaces of both ends of the force blocks 905 are fixedly connected with magnets 906 with T-shaped surfaces by bolts.

[0044] When in use, the surface of the force applying block 905 is in a U shape, so that when the force applying block 905 is subjected to force, it can withstand and produce a certain deformation, so that the locking pawl 1013 can lock the locking ratchet 1003 and the driving ratchet 1004.

[0045] The inner wall of the step groove is fixedly provided with an inserting groove, and the inner walls of the two inserting grooves are respectively adapted to be slidably inserted into the surfaces of the two magnets 906 .

[0046] When in use, the force block 905 is magnetically connected to the two tool clamping blocks 9 through the magnet 906, so that the two tool clamping blocks 9 can move together with the force block 905, and the magnet 906 is in a T shape and cooperates with the plug-in slot to crimp, position and limit the tool clamping blocks 9.

[0047] A guide rod 907 is fixedly connected to the upper surface of the force block 905 . The two guide rods 907 are symmetrically and staggeredly distributed around the axis of the force block 905 . One end of the guide rod 907 penetrates and extends to the upper surface of the electric tool holder 802 .

[0048] When in use, the guide rod 907 has the characteristic of guiding the movement and limiting the force applying block 905 .

[0049] A driving column 908 is fixedly connected to the upper surface of the force block 905 , one end of which passes through and extends to the upper surface of the electric tool holder 802 , and a driving bevel groove 909 is fixedly provided on the surface of the driving column 908 , and a plurality of driving bevel grooves 909 are evenly distributed on the surface of the driving column 908 .

[0050] The limit drive mechanism includes a drive frame 10, which is fixedly mounted on the upper surface of the electric tool holder 802. A bearing seat 1001 is fixedly mounted on the upper surface of the drive frame 10, and the inner wall of the bearing seat 1001 is rotatably connected to a drive shaft 1002 via a bearing.

[0051] The two ends of the driving shaft 1002 are respectively fixedly connected with a locking ratchet 1003 and a driving ratchet 1004 , and the surface of the driving ratchet 1004 is plugged into the inner wall of the driving bevel tooth groove 909 .

[0052] When in use, the driving ratchet 1004 is plugged into the driving bevel tooth groove 909 , and when the driving ratchet 1004 rotates, the driving bevel tooth groove 909 drives the driving column 908 to move.

[0053] The surface of the driving shaft 1002 is rotatably connected to a force applying handle 1005, the inner wall of the force applying handle 1005 is slidingly connected to the surface of the locking ratchet 1003, the inner wall of the force applying handle 1005 is rotatably connected to a driving tooth tongue 1006, and one end of the driving tooth tongue 1006 is plugged into the surface of the locking ratchet 1003.

[0054] When in use, by rotating the force applying handle 1005 , the force applying handle 1005 drives the driving tongue 1006 to drive the locking ratchet 1003 to rotate, and drives the driving shaft 1002 and the driving ratchet 1004 to rotate.

[0055] The upper surface and lower surface of the other end of the driving tongue 1006 are respectively provided with a limiting arc groove 1007 and an auxiliary groove 1008, and the inner wall of the auxiliary groove 1008 is fixedly connected with a support spring 1009, and one end of the support spring 1009 is plugged into the inner bottom wall of the force handle 1005.

[0056] The upper surface of the force applying handle 1005 is threadedly connected with a handle limiting bolt 1010 , and one end of the handle limiting bolt 1010 penetrates and extends to the inner wall of the force applying handle 1005 and is plugged into the inner wall of the limiting arc groove 1007 .

[0057] When in use, the driving tongue 1006 is supported by the cooperation of the support spring 1009 and the inner bottom wall of the force applying handle 1005, so that the driving tongue 1006 can be quickly plugged into the locking ratchet 1003, thereby achieving the effect of quickly driving the locking ratchet 1003 to rotate.

[0058] The inner wall of the driving frame 10 is rotatably connected to a locking shaft 1011, the surface of the locking shaft 1011 is sleeved with a torsion spring 1012, the surface of the locking shaft 1011 is fixedly connected to a locking pawl 1013, the two ends of the torsion spring 1012 are respectively fixedly connected to the inner wall of the driving frame 10 and the surface of the locking pawl 1013, and one end of the locking pawl 1013 is plugged into the surface of the locking ratchet 1003.

[0059] When in use, the locking pawl 1013 is always kept plugged and locked on the locking ratchet 1003 by the torsion spring 1012, thereby locking the driving shaft 1002 and the driving ratchet 1004.

[0060] A method for replacing a quick-changing device for a numerical control tool comprises the following steps: Step 1: When replacing the chip cutting tool on the electric tool holder 802 , the locking pawl 1013 is moved to separate the locking pawl 1013 from the locking ratchet 1003 , the locking of the locking ratchet 1003 is released, and then the driving column 908 is lifted.

[0061] Step 2: The force block 905 is driven to move upward by pulling the driving column 908. The force block 905 drives the two tool clamping blocks 9 to separate from the tool through the magnet 906, and the tool is taken out.

[0062] Step 3, after taking out the tool in the tool slot and putting a new tool into the tool slot, release the lifting of the driving column 908, and under the gravity of the tool clamping block 9 and the force block 905, the tool clamping block 9 and the force block 905 move downward, and the lower surface of the tool clamping block 9 is plugged into the surface of the tool, and then the driving tooth tongue 1006 on the force handle 1005 is plugged into the surface of the locking ratchet 1003, and then the force handle 1005 is turned, and the force handle 1005 drives the locking ratchet 1003 to rotate, and the locking The stop ratchet 1003 drives the driving shaft 1002 and the driving ratchet 1004 to rotate, and the driving ratchet 1004 drives the driving column 908 to move downward by driving the bevel tooth groove 909, and drives the force block 905 to move downward, so that the two tool clamping blocks 9 are plugged and pressed against the surface of the tool to lock the tool, and when the locking ratchet 1003 rotates, the locking pawl 1013 is always in contact with the surface of the locking ratchet 1003 through the force of the torsion spring 1012, thereby locking the locking ratchet 1003.

[0063] By setting up a quick clamping mechanism and a limit driving mechanism, when in use, the quick clamping mechanism is driven and limited by the limit driving mechanism. When the tool is replaced, the tool can be quickly taken out of the tool slot and put into the tool slot, and the tool can be quickly locked and installed, thereby solving the problem of low tool replacement efficiency of existing CNC machine tools.

[0064] By setting a limit drive mechanism, when in use, the locking ratchet 1003 is locked by the locking pawl 1013 in the limit drive mechanism, so as to lock the drive shaft 1002 and the drive ratchet 1004, and lock the force block 905 and the tool clamping block 9, thereby solving the problem that the existing replacement method uses bolts to clamp the tool, but the contact area is small, and the bolts are connected to the tool holder through threads to lock the tool, and the bolts often become loose, causing the tool to move, thereby affecting the processing accuracy.

[0065] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for quickly changing a numerically controlled tool, comprising a numerically controlled machine tool body, the numerically controlled machine tool body comprising a machine tool base (1), a machine tool body (2) on the upper surface of the machine tool base (1), a control system (3) arranged on the surface of the machine tool body (2), and a machine tool protection door (4) slidably connected to the surface of the machine tool body (2), wherein a three-jaw chuck (5) for clamping a workpiece, a tailstock (6) for assisting in machining the workpiece, a drive system (7) for machining drive, and a tool rest system (8) for machining the workpiece are arranged inside the machine tool body (2), characterized in that: The tool holder system (8) is composed of a longitudinal feeding mechanism (801) for driving the tool holder to move longitudinally and an electric tool holder (802) for automatically changing tools during workpiece processing; The upper surface of the electric tool holder (802) is provided with a quick clamping mechanism for quickly replacing a machining tool and a limit driving mechanism for driving and limiting the quick clamping mechanism; The four quick clamping mechanisms and the four limit drive mechanisms are symmetrically distributed on the upper surface of the electric tool holder (802), respectively corresponding to the four tool slots provided on the electric tool holder (802); When the locking pawl (1013) and the locking ratchet (1003) in the limit drive mechanism are plugged in, the tool is clamped and locked, thereby facilitating quick installation of the tool. When the locking pawl (1013) and the locking ratchet (1003) in the limit drive mechanism of the quick clamping mechanism are separated, the clamping limit lock of the tool is released, thereby facilitating quick removal of the tool.

2. The rapid replacement device for numerical control tools according to claim 1, characterized in that: The quick clamping mechanism comprises a tool clamping block (9), wherein the two tool clamping blocks (9) are symmetrically distributed with the axis of the tool slot as the center, and the lower surfaces of the two tool clamping blocks (9) are provided with knurling for increasing the friction force of clamping the tool; A guide limit column (901) is fixedly connected to the upper surface of the tool pressing block (9), and two guide grooves (902) corresponding to the guide limit columns (901) are fixedly provided on the inner top wall of the tool groove, and the inner walls at both ends of the guide grooves (902) are in an arc shape.

3. A quick-change device for numerically controlled tools according to claim 2, characterized in that: One end of the guide limit column (901) extends to the upper surface of the electric tool holder (802) through the guide groove (902), and the surface of the guide limit column (901) is adapted to be slidably connected with the inner wall of the guide groove (902); The inner wall of the guide groove (902) is rotatably connected to a limiting ball (903) via a rotating groove, and a plurality of the limiting balls (903) are symmetrically distributed with the axis of the guide groove (902) as the center. Two symmetrically distributed ball grooves (904) are fixedly provided on the surface of the guide limiting column (901), and the inner wall of the ball groove (904) is slidably connected to the surface of the limiting ball (903).

4. The rapid replacement device for numerical control tools according to claim 3, characterized in that: The surfaces of the two tool clamping blocks (9) are both provided with step grooves, the inner walls of the step grooves are slidably connected with force applying blocks (905), the surfaces of the force applying blocks (905) are U-shaped, and the surfaces of both ends of the force applying blocks (905) are fixedly connected with magnets (906) with T-shaped surfaces via bolts; The inner wall of the step groove is fixedly provided with an inserting groove, and the inner walls of the two inserting grooves are respectively adapted to be slidably inserted into the surfaces of the two magnets (906).

5. The rapid replacement device for numerically controlled tools according to claim 4, characterized in that: A guide rod (907) is fixedly connected to the upper surface of the force applying block (905); the two guide rods (907) are symmetrically and staggeredly distributed around the axis of the force applying block (905); one end of the guide rod (907) penetrates and extends to the upper surface of the electric tool holder (802).

6. A CNC tool quick-change device according to claim 5, characterized in that: A driving column (908) is fixedly connected to the upper surface of the force applying block (905), one end of the driving column (908) penetrates and extends to the upper surface of the electric tool holder (802), a driving bevel tooth groove (909) is fixedly provided on the surface of the driving column (908), and a plurality of the driving bevel tooth grooves (909) are evenly distributed on the surface of the driving column (908); The limit drive mechanism comprises a drive frame (10), the drive frame (10) being fixedly mounted on the upper surface of the electric tool holder (802), a bearing seat (1001) being fixedly mounted on the upper surface of the drive frame (10), and an inner wall of the bearing seat (1001) being rotatably connected to a drive shaft (1002) via a bearing; A locking ratchet (1003) and a driving ratchet (1004) are respectively fixedly connected at both ends of the driving shaft (1002), and the surface of the driving ratchet (1004) is plugged into the inner wall of the driving bevel tooth groove (909).

7. A rapid replacement device for numerically controlled tools according to claim 6, characterized in that: The surface of the driving shaft (1002) is rotatably connected to a force applying handle (1005), the inner wall of the force applying handle (1005) is slidably connected to the surface of the locking ratchet (1003), the inner wall of the force applying handle (1005) is rotatably connected to a driving tooth tongue (1006), and one end of the driving tooth tongue (1006) is plugged into the surface of the locking ratchet (1003).

8. The rapid replacement device for numerical control tools according to claim 7, characterized in that: The upper surface and lower surface of the other end of the driving tongue (1006) are respectively provided with a limiting arc groove (1007) and an auxiliary groove (1008); the inner wall of the auxiliary groove (1008) is fixedly connected with a support spring (1009); one end of the support spring (1009) is plugged into the inner bottom wall of the force application handle (1005); The upper surface of the force applying handle (1005) is threadedly connected with a handle limiting bolt (1010), and one end of the handle limiting bolt (1010) penetrates and extends to the inner wall of the force applying handle (1005) and is plugged into the inner wall of the limiting arc groove (1007).

9. The rapid replacement device for numerically controlled tools according to claim 8, characterized in that: The inner wall of the driving frame (10) is rotatably connected to a locking shaft (1011), the surface of the locking shaft (1011) is sleeved with a torsion spring (1012), the surface of the locking shaft (1011) is fixedly connected to a locking pawl (1013), the two ends of the torsion spring (1012) are respectively fixedly connected to the inner wall of the driving frame (10) and the surface of the locking pawl (1013), and one end of the locking pawl (1013) is plugged into the surface of the locking ratchet (1003).

10. A method for replacing a CNC tool quick-change device, comprising the CNC tool quick-change device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: When replacing the chip cutting tool on the electric tool holder (802), the locking pawl (1013) is moved to separate the locking pawl (1013) from the locking ratchet (1003), the locking of the locking ratchet (1003) is released, and then the driving column (908) is lifted; Step 2: The force applying block (905) is driven to move upward by lifting the driving column (908), and the force applying block (905) drives the two tool pressing blocks (9) to separate from the tool through the magnet (906), and the tool is taken out; Step 3: After taking out the tool from the tool slot and placing a new tool into the tool slot, release the pull on the drive column (908), and under the gravity of the tool clamping block (9) and the force block (905), the tool clamping block (9) and the force block (905) move downward, and the lower surface of the tool clamping block (9) is plugged into the surface of the tool, and then the driving tongue (1006) on the force handle (1005) is plugged into the surface of the locking ratchet (1003), and the force handle (1005) is turned, and the force handle (1005) drives the locking ratchet (1003) to rotate, thereby locking the tool. The ratchet (1003) drives the driving shaft (1002) and the driving ratchet (1004) to rotate. The driving ratchet (1004) drives the driving column (908) to move downward by driving the helical tooth groove (909), thereby driving the force applying block (905) to move downward, so that the two tool pressing blocks (9) are inserted and pressed against the surface of the tool to lock the tool. When the locking ratchet (1003) rotates, the locking pawl (1013) is always in contact with the surface of the locking ratchet (1003) through the action force of the torsion spring (1012), thereby locking the locking ratchet (1003).

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